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Endocochlear potential and endolymphatic K+ changes induced by gap junction blockers.
Masaaki Suzuki1, Toshihiko Kikuchi, Katsuhisa Ikeda
1Department of Otorhinolaryngology-Head and Neck Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan. msuzuki@sleep.ac
Acta Oto-Laryngologica
|October 30, 2004
Summary
Gap junction blockers like n-heptanol significantly reduce the endocochlear potential (EP) and endolymphatic potassium levels in guinea pigs, suggesting impaired potassium transport.
Area of Science:
- Otolaryngology
- Neuroscience
- Physiology
Background:
- The endocochlear potential (EP) is crucial for hearing.
- Gap junctions play a role in cochlear ion homeostasis.
Purpose of the Study:
- To investigate the impact of gap junction blockers on EP and endolymphatic potassium concentration ([K(+)](e)).
Main Methods:
- EP and [K(+)](e) were measured in guinea pig cochlea using microelectrodes.
- Perilymphatic perfusion with n-heptanol, hexanol, and ethanol was performed.
Main Results:
- n-Heptanol and hexanol significantly decreased EP and [K(+)](e).
- Ethanol showed no significant effect.
- Anoxia confirmed EP generation mechanisms.
Conclusions:
- Long-chain n-alkanols, acting as gap junction blockers, disrupt potassium transport.
- This disruption is linked to gap junction dysfunction and reduced EP.